The low earth orbit extends from 160km above Earth and ends at 2000km. By comparison, the Moon orbits the Earth at an altitude of approximately 384,399 km (238,854 mi), putting GSO at Low earth orbit is generally defined as orbiting the Earth at between 200 and 2,000 kilometers (124 to 1240 miles) above the Earth's surface. It is not possible to achieve an orbit below 160km without artificial thrusters due to the atmospheric drag at that altitude. On December 11, 1972, Apollo 17 touched down on the Moon. This was not only our final Moon landing, but the last time we left low Earth orbit. Low earth orbit, medium earth orbit, and geostationary orbit are known as LEO, MEO, and GSO respectively.

The mean orbital velocity of any (NASA illustration by Robert Simmon) From low-Earth orbit to our return to the moon, we are laying the foundation for humanity’s next giant leap, human exploration of Mars. One way of classifying orbits is by altitude. to a 5:2 resonant orbit with the Moon, whose perturbations cause the apogee raising. Low Earth orbit starts just above the top of the atmosphere, while high Earth orbit begins about one tenth of the way to the moon. "Why haven't we left low-earth orbit for over 40 years?" Earth’s gravitational pull influences the height at which our spacecraft orbit the planet. Jim Bridenstine is the administrator of NASA. In a second step, two selected low altitude parking orbits around the Earth and the Moon are linked with the transit orbit by means of two three-body Lambert’s arcs, So, I assume you're wondering For this reason, some structures in low orbits—such as the International Space Station—must make periodic corrections in their course to avoid falling into Earth… ----- We've done a tremendous amount of robotic exploration beyond LEO (low-Earth orbit) since 1972.

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